Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Carlos, the 2 HXs used in this object define the effectiveness used in the simulation. The HeatExchanger:AirToAir:FlatPlate uses the NTU method where design effectiveness is derived from user inputs. The other HX is HeatExchanger:AirToAir:SensibleAndLatent where effectiveness is a user input. Since the SensibleAndLatent model does have report variables for effectiveness while the FlatPlate model does not I assume you are asking about the FlatPlate model and what the effectiveness is during your simulation. You can post process this information using the T and w node reports at the inlet/outlet of the HX.
Using node reporting: Output:Variable,,System Node Temperature,hourly; !- HVAC Average [C] Output:Variable,,System Node Humidity Ratio,hourly; !- HVAC Average [kgWater/kgDryAir]
The temperature effectiveness is:
Eps = ( Tsup,out - Tsup,in ) / ( Texh,in - T sup,in ) pg. 179 Engineering Reference, Eq 15.1139
Same equation for w effectiveness.
